Quality and sustainable infrastructure investments are needed to rebuild smartly and create a more resilient, inclusive, and equitable world. Digital transformation has become an urgent need for governments. This publication presents the SOURCE platform, a digital transformation tool that is financed and led by multilateral development banks. SOURCE is a key tool for governments to prepare well-developed projects in alignment with international standards such as the G20 Principles for Quality Infrastructure Investment. SOURCE can be integral to capacity building for best practices in project management, for building infrastructure databases for measuring achievements, and for raising bankability and attracting private sector financing of projects contributing to the Sustainable Development Goals and the Paris Agreement.